package com.jframe.sys.utils;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;


public class MyEclipseGen {
 public static final void main(String[] args) {
  String id = "liuweiy"; // 可更给为您的名字
  String num = "999";// 许可证数量
  System.out.println(getSerial(id, "100", num, false));
 }

 public static String getSerial(String userId, String version, String licenseNum, boolean selected) {
  Calendar cal = Calendar.getInstance();
  cal.add(1, 3);
  cal.add(6, -1);
  NumberFormat nf = new DecimalFormat("000");
  licenseNum = nf.format(Integer.valueOf(licenseNum));
  String verTime = selected ? (new StringBuffer("-")).append((new SimpleDateFormat("yyMMdd")).format(cal.getTime())).append("0").toString() :

       "-1512310";//表示20101231，可改为自己需要的日期-1012310

  String type = "YE3MB-";
  String need = (new StringBuffer(String.valueOf(userId.substring(0, 1)))).append(type).append(version).append(licenseNum).append(verTime).toString();
  String dx = (new StringBuffer(String.valueOf(need))).append("Decompiling this copyrighted software is a violation of both your license agreement and the Digital Millenium Copyright Act of 1998 (http://www.loc.gov/copyright/legislation/dmca.pdf). Under section 1204 of the DMCA, penalties range up to a $500,000 fine or up to five years imprisonment for a first offense. Think about it; pay for a license, avoid prosecution, and feel better about yourself.").append(userId).toString();
  int suf = decode(dx);
  String code = (new StringBuffer(String.valueOf(need))).append(String.valueOf(suf)).toString();
  return change(code);
 }

 private static int decode(String s) {
  int i = 0;
  char ac[] = s.toCharArray();
  int j = 0;
  for (int k = ac.length; j < k; j++)
   i = 31 * i + ac[j];
  return Math.abs(i);
 }

 private static String change(String s) {
  byte abyte0[] = s.getBytes();
  char ac[] = new char[s.length()];
  int i = 0;
  for (int k = abyte0.length; i < k; i++) {
   int j = abyte0[i];
   if (j >= 48 && j <= 57)
    j = ((j - 48) + 5) % 10 + 48;
   else if (j >= 65 && j <= 90)
    j = ((j - 65) + 13) % 26 + 65;
   else if (j >= 97 && j <= 122)
    j = ((j - 97) + 13) % 26 + 97;
   ac[i] = (char) j;
  }
  return String.valueOf(ac);
 }
}

